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><H1
><A
NAME="SQL-ALTERFOREIGNDATAWRAPPER"
></A
>ALTER FOREIGN DATA WRAPPER</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN60230"
></A
><H2
>Name</H2
>ALTER FOREIGN DATA WRAPPER&nbsp;--&nbsp;change the definition of a foreign-data wrapper</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN60235"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>ALTER FOREIGN DATA WRAPPER <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
>
    [ HANDLER <TT
CLASS="REPLACEABLE"
><I
>handler_function</I
></TT
> | NO HANDLER ]
    [ VALIDATOR <TT
CLASS="REPLACEABLE"
><I
>validator_function</I
></TT
> | NO VALIDATOR ]
    [ OPTIONS ( [ ADD | SET | DROP ] <TT
CLASS="REPLACEABLE"
><I
>option</I
></TT
> ['<TT
CLASS="REPLACEABLE"
><I
>value</I
></TT
>'] [, ... ]) ]
ALTER FOREIGN DATA WRAPPER <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
> OWNER TO <TT
CLASS="REPLACEABLE"
><I
>new_owner</I
></TT
></PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN60244"
></A
><H2
>Description</H2
><P
>   <TT
CLASS="COMMAND"
>ALTER FOREIGN DATA WRAPPER</TT
> changes the
   definition of a foreign-data wrapper.  The first form of the
   command changes the support functions or the generic options of the
   foreign-data wrapper (at least one clause is required).  The second
   form changes the owner of the foreign-data wrapper.
  </P
><P
>   Only superusers can alter foreign-data wrappers.  Additionally,
   only superusers can own foreign-data wrappers.
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN60249"
></A
><H2
>Parameters</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
></DT
><DD
><P
>      The name of an existing foreign-data wrapper.
     </P
></DD
><DT
><TT
CLASS="LITERAL"
>HANDLER <TT
CLASS="REPLACEABLE"
><I
>handler_function</I
></TT
></TT
></DT
><DD
><P
>      Specifies a new handler function for the foreign-data wrapper.
     </P
></DD
><DT
><TT
CLASS="LITERAL"
>NO HANDLER</TT
></DT
><DD
><P
>      This is used to specify that the foreign-data wrapper should no
      longer have a handler function.
     </P
><P
>      Note that foreign tables that use a foreign-data wrapper with no
      handler cannot be accessed.
     </P
></DD
><DT
><TT
CLASS="LITERAL"
>VALIDATOR <TT
CLASS="REPLACEABLE"
><I
>validator_function</I
></TT
></TT
></DT
><DD
><P
>      Specifies a new validator function for the foreign-data wrapper.
     </P
><P
>      Note that it is possible that after changing the validator the
      options to the foreign-data wrapper, servers, and user mappings
      have become invalid.   It is up to the user to make sure that
      these options are correct before using the foreign-data
      wrapper.
     </P
></DD
><DT
><TT
CLASS="LITERAL"
>NO VALIDATOR</TT
></DT
><DD
><P
>      This is used to specify that the foreign-data wrapper should no
      longer have a validator function.
     </P
></DD
><DT
><TT
CLASS="LITERAL"
>OPTIONS ( [ ADD | SET | DROP ] <TT
CLASS="REPLACEABLE"
><I
>option</I
></TT
> ['<TT
CLASS="REPLACEABLE"
><I
>value</I
></TT
>'] [, ... ] )</TT
></DT
><DD
><P
>      Change options for the foreign-data
      wrapper.  <TT
CLASS="LITERAL"
>ADD</TT
>, <TT
CLASS="LITERAL"
>SET</TT
>, and <TT
CLASS="LITERAL"
>DROP</TT
>
      specify the action to be performed.  <TT
CLASS="LITERAL"
>ADD</TT
> is assumed
      if no operation is explicitly specified.  Option names must be
      unique; names and values are also validated using the foreign
      data wrapper's validator function, if any.
     </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN60292"
></A
><H2
>Examples</H2
><P
>   Change a foreign-data wrapper <TT
CLASS="LITERAL"
>dbi</TT
>, add
   option <TT
CLASS="LITERAL"
>foo</TT
>, drop <TT
CLASS="LITERAL"
>bar</TT
>:
</P><PRE
CLASS="PROGRAMLISTING"
>ALTER FOREIGN DATA WRAPPER dbi OPTIONS (ADD foo '1', DROP 'bar');</PRE
><P>
  </P
><P
>   Change the foreign-data wrapper <TT
CLASS="LITERAL"
>dbi</TT
> validator
   to <TT
CLASS="LITERAL"
>bob.myvalidator</TT
>:
</P><PRE
CLASS="PROGRAMLISTING"
>ALTER FOREIGN DATA WRAPPER dbi VALIDATOR bob.myvalidator;</PRE
><P></P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN60303"
></A
><H2
>Compatibility</H2
><P
>   <TT
CLASS="COMMAND"
>ALTER FOREIGN DATA WRAPPER</TT
> conforms to ISO/IEC
   9075-9 (SQL/MED), except that the <TT
CLASS="LITERAL"
>HANDLER</TT
>,
   <TT
CLASS="LITERAL"
>VALIDATOR</TT
> and <TT
CLASS="LITERAL"
>OWNER TO</TT
> clauses are extensions.
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN60310"
></A
><H2
>See Also</H2
><A
HREF="sql-createforeigndatawrapper.html"
>CREATE FOREIGN DATA WRAPPER</A
>, <A
HREF="sql-dropforeigndatawrapper.html"
>DROP FOREIGN DATA WRAPPER</A
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